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    <div id="content" role="main">
      <h1>Source code for isek.isek_center</h1><div class="highlight"><pre>
<span></span><code><span id="line-1"><span class="kn">import</span><span class="w"> </span><span class="nn">json</span>
</span><span id="line-2"><span class="kn">import</span><span class="w"> </span><span class="nn">threading</span>
</span><span id="line-3"><span class="kn">import</span><span class="w"> </span><span class="nn">time</span>
</span><span id="line-4"><span class="kn">from</span><span class="w"> </span><span class="nn">typing</span><span class="w"> </span><span class="kn">import</span> <span class="n">Dict</span><span class="p">,</span> <span class="n">Any</span><span class="p">,</span> <span class="n">Optional</span><span class="p">,</span> <span class="n">Tuple</span><span class="p">,</span> <span class="n">Union</span> <span class="c1"># Added Optional, Tuple, Union</span>
</span><span id="line-5">
</span><span id="line-6"><span class="kn">from</span><span class="w"> </span><span class="nn">flask</span><span class="w"> </span><span class="kn">import</span> <span class="n">Flask</span><span class="p">,</span> <span class="n">request</span><span class="p">,</span> <span class="n">jsonify</span><span class="p">,</span> <span class="n">Blueprint</span>
</span><span id="line-7"><span class="kn">from</span><span class="w"> </span><span class="nn">werkzeug.exceptions</span><span class="w"> </span><span class="kn">import</span> <span class="n">HTTPException</span> <span class="c1"># For type hinting Flask error responses</span>
</span><span id="line-8">
</span><span id="line-9"><span class="c1"># --- Global State &amp; Configuration ---</span>
</span><span id="line-10"><span class="n">isek_center_blueprint</span> <span class="o">=</span> <span class="n">Blueprint</span><span class="p">(</span><span class="s1">&#39;isek_center_blueprint&#39;</span><span class="p">,</span> <span class="vm">__name__</span><span class="p">,</span> <span class="n">url_prefix</span><span class="o">=</span><span class="s1">&#39;/isek_center&#39;</span><span class="p">)</span>
</span><span id="line-11">
</span><span id="line-12"><span class="c1"># In-memory storage for registered nodes.</span>
</span><span id="line-13"><span class="c1"># Structure: { &quot;node_id&quot;: {&quot;node_id&quot;: str, &quot;host&quot;: str, &quot;port&quot;: int, &quot;metadata&quot;: dict, &quot;expires_at&quot;: float} }</span>
</span><span id="line-14"><span class="n">nodes</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Any</span><span class="p">]]</span> <span class="o">=</span> <span class="p">{}</span>
</span><span id="line-15"><span class="n">NODE_LOCK</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Lock</span><span class="p">()</span> <span class="c1"># To protect access to the &#39;nodes&#39; dictionary</span>
</span><span id="line-16">
</span><span id="line-17"><span class="n">LEASE_DURATION</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">30</span>  <span class="c1"># Seconds for node lease</span>
</span><span id="line-18">
</span><span id="line-19">
</span><span id="line-20"><span class="c1"># --- Response Helper Class ---</span>
<div class="viewcode-block" id="CommonResponse">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.CommonResponse">[docs]</a>
</span><span id="line-21"><span class="k">class</span><span class="w"> </span><span class="nc">CommonResponse</span><span class="p">:</span>
</span><span id="line-22"><span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-23"><span class="sd">    A helper class to standardize JSON API responses.</span>
</span><span id="line-24"><span class="sd">    &quot;&quot;&quot;</span>
</span><span id="line-25">    <span class="k">def</span><span class="w"> </span><span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">data</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Any</span><span class="p">],</span> <span class="n">code</span><span class="p">:</span> <span class="nb">int</span><span class="p">,</span> <span class="n">message</span><span class="p">:</span> <span class="nb">str</span><span class="p">):</span>
</span><span id="line-26"><span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-27"><span class="sd">        Initializes a CommonResponse object.</span>
</span><span id="line-28">
</span><span id="line-29"><span class="sd">        :param data: The payload data of the response. Can be None.</span>
</span><span id="line-30"><span class="sd">        :type data: typing.Optional[typing.Any]</span>
</span><span id="line-31"><span class="sd">        :param code: The HTTP-like status code for the response (e.g., 200 for success, 500 for fail).</span>
</span><span id="line-32"><span class="sd">        :type code: int</span>
</span><span id="line-33"><span class="sd">        :param message: A descriptive message accompanying the response.</span>
</span><span id="line-34"><span class="sd">        :type message: str</span>
</span><span id="line-35"><span class="sd">        &quot;&quot;&quot;</span>
</span><span id="line-36">        <span class="bp">self</span><span class="o">.</span><span class="n">data</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Any</span><span class="p">]</span> <span class="o">=</span> <span class="n">data</span>
</span><span id="line-37">        <span class="bp">self</span><span class="o">.</span><span class="n">code</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="n">code</span>
</span><span id="line-38">        <span class="bp">self</span><span class="o">.</span><span class="n">message</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="n">message</span>
</span><span id="line-39">
<div class="viewcode-block" id="CommonResponse.success">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.CommonResponse.success">[docs]</a>
</span><span id="line-40">    <span class="nd">@classmethod</span>
</span><span id="line-41">    <span class="k">def</span><span class="w"> </span><span class="nf">success</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">data</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Any</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">,</span> <span class="n">code</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">200</span><span class="p">,</span> <span class="n">message</span><span class="p">:</span> <span class="nb">str</span> <span class="o">=</span> <span class="s1">&#39;success&#39;</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Tuple</span><span class="p">[</span><span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Any</span><span class="p">],</span> <span class="nb">int</span><span class="p">]:</span>
</span><span id="line-42"><span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-43"><span class="sd">        Creates a standardized success response.</span>
</span><span id="line-44">
</span><span id="line-45"><span class="sd">        :param data: Optional data payload for the success response.</span>
</span><span id="line-46"><span class="sd">        :type data: typing.Optional[typing.Any]</span>
</span><span id="line-47"><span class="sd">        :param code: The success code. Defaults to 200.</span>
</span><span id="line-48"><span class="sd">        :type code: int</span>
</span><span id="line-49"><span class="sd">        :param message: The success message. Defaults to &#39;success&#39;.</span>
</span><span id="line-50"><span class="sd">        :type message: str</span>
</span><span id="line-51"><span class="sd">        :return: A tuple containing the response dictionary and the HTTP status code.</span>
</span><span id="line-52"><span class="sd">        :rtype: typing.Tuple[typing.Dict[str, typing.Any], int]</span>
</span><span id="line-53"><span class="sd">        &quot;&quot;&quot;</span>
</span><span id="line-54">        <span class="k">return</span> <span class="n">jsonify</span><span class="p">(</span><span class="bp">cls</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">code</span><span class="p">,</span> <span class="n">message</span><span class="p">)</span><span class="o">.</span><span class="n">to_dict</span><span class="p">()),</span> <span class="n">code</span></div>

</span><span id="line-55">
<div class="viewcode-block" id="CommonResponse.fail">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.CommonResponse.fail">[docs]</a>
</span><span id="line-56">    <span class="nd">@classmethod</span>
</span><span id="line-57">    <span class="k">def</span><span class="w"> </span><span class="nf">fail</span><span class="p">(</span><span class="bp">cls</span><span class="p">,</span> <span class="n">message</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">code</span><span class="p">:</span> <span class="nb">int</span> <span class="o">=</span> <span class="mi">400</span><span class="p">,</span> <span class="n">data</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Any</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Tuple</span><span class="p">[</span><span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Any</span><span class="p">],</span> <span class="nb">int</span><span class="p">]:</span>
</span><span id="line-58"><span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-59"><span class="sd">        Creates a standardized failure/error response.</span>
</span><span id="line-60">
</span><span id="line-61"><span class="sd">        Commonly used for client errors (e.g., bad request, not found).</span>
</span><span id="line-62">
</span><span id="line-63"><span class="sd">        :param message: The failure message.</span>
</span><span id="line-64"><span class="sd">        :type message: str</span>
</span><span id="line-65"><span class="sd">        :param code: The error code. Defaults to 400 (Bad Request).</span>
</span><span id="line-66"><span class="sd">        :type code: int</span>
</span><span id="line-67"><span class="sd">        :param data: Optional data payload accompanying the failure.</span>
</span><span id="line-68"><span class="sd">        :type data: typing.Optional[typing.Any]</span>
</span><span id="line-69"><span class="sd">        :return: A tuple containing the response dictionary and the HTTP status code.</span>
</span><span id="line-70"><span class="sd">        :rtype: typing.Tuple[typing.Dict[str, typing.Any], int]</span>
</span><span id="line-71"><span class="sd">        &quot;&quot;&quot;</span>
</span><span id="line-72">        <span class="k">return</span> <span class="n">jsonify</span><span class="p">(</span><span class="bp">cls</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">code</span><span class="p">,</span> <span class="n">message</span><span class="p">)</span><span class="o">.</span><span class="n">to_dict</span><span class="p">()),</span> <span class="n">code</span></div>

</span><span id="line-73">
<div class="viewcode-block" id="CommonResponse.to_dict">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.CommonResponse.to_dict">[docs]</a>
</span><span id="line-74">    <span class="k">def</span><span class="w"> </span><span class="nf">to_dict</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-&gt;</span> <span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Any</span><span class="p">]:</span>
</span><span id="line-75"><span class="w">        </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-76"><span class="sd">        Converts the CommonResponse instance to a dictionary.</span>
</span><span id="line-77">
</span><span id="line-78"><span class="sd">        :return: A dictionary representation of the response.</span>
</span><span id="line-79"><span class="sd">        :rtype: typing.Dict[str, typing.Any]</span>
</span><span id="line-80"><span class="sd">        &quot;&quot;&quot;</span>
</span><span id="line-81">        <span class="k">return</span> <span class="p">{</span>
</span><span id="line-82">            <span class="s2">&quot;code&quot;</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">code</span><span class="p">,</span>
</span><span id="line-83">            <span class="s2">&quot;message&quot;</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">message</span><span class="p">,</span>
</span><span id="line-84">            <span class="s2">&quot;data&quot;</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">data</span>
</span><span id="line-85">        <span class="p">}</span></div>
</div>

</span><span id="line-86">
</span><span id="line-87"><span class="c1"># --- Flask Route Definitions ---</span>
</span><span id="line-88"><span class="n">FlaskResponse</span> <span class="o">=</span> <span class="n">Tuple</span><span class="p">[</span><span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Any</span><span class="p">],</span> <span class="nb">int</span><span class="p">]</span> <span class="c1"># Type alias for Flask view return</span>
</span><span id="line-89">
<div class="viewcode-block" id="register_node_route">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.register_node_route">[docs]</a>
</span><span id="line-90"><span class="nd">@isek_center_blueprint</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">&#39;/register&#39;</span><span class="p">,</span> <span class="n">methods</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;POST&#39;</span><span class="p">])</span>
</span><span id="line-91"><span class="k">def</span><span class="w"> </span><span class="nf">register_node_route</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="n">FlaskResponse</span><span class="p">:</span>
</span><span id="line-92"><span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-93"><span class="sd">    Registers a new node or updates an existing node&#39;s registration.</span>
</span><span id="line-94">
</span><span id="line-95"><span class="sd">    Expects a JSON payload with `node_id`, `host`, `port`, and optional `metadata`.</span>
</span><span id="line-96"><span class="sd">    Assigns an expiration time to the node&#39;s registration (lease).</span>
</span><span id="line-97">
</span><span id="line-98"><span class="sd">    **Request JSON Body:**</span>
</span><span id="line-99"><span class="sd">    </span>
</span><span id="line-100"><span class="sd">    .. code-block:: json</span>
</span><span id="line-101">
</span><span id="line-102"><span class="sd">        {</span>
</span><span id="line-103"><span class="sd">            &quot;node_id&quot;: &quot;unique_node_identifier&quot;,</span>
</span><span id="line-104"><span class="sd">            &quot;host&quot;: &quot;node_hostname_or_ip&quot;,</span>
</span><span id="line-105"><span class="sd">            &quot;port&quot;: 8080,</span>
</span><span id="line-106"><span class="sd">            &quot;metadata&quot;: {&quot;key&quot;: &quot;value&quot;} </span>
</span><span id="line-107"><span class="sd">        }</span>
</span><span id="line-108">
</span><span id="line-109"><span class="sd">    **Responses:**</span>
</span><span id="line-110"><span class="sd">    </span>
</span><span id="line-111"><span class="sd">    - **200 OK:** Node registered successfully.</span>
</span><span id="line-112"><span class="sd">    - **400 Bad Request:** Missing required fields (`node_id`, `host`, `port`).</span>
</span><span id="line-113">
</span><span id="line-114"><span class="sd">    :return: A Flask JSON response.</span>
</span><span id="line-115"><span class="sd">    :rtype: FlaskResponse</span>
</span><span id="line-116"><span class="sd">    &quot;&quot;&quot;</span>
</span><span id="line-117">    <span class="n">data</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">json</span>
</span><span id="line-118">    <span class="k">if</span> <span class="ow">not</span> <span class="n">data</span><span class="p">:</span>
</span><span id="line-119">        <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="s2">&quot;Request body must be JSON.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">400</span><span class="p">)</span>
</span><span id="line-120">
</span><span id="line-121">    <span class="n">node_id</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;node_id&#39;</span><span class="p">)</span>
</span><span id="line-122">    <span class="n">host</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;host&#39;</span><span class="p">)</span>
</span><span id="line-123">    <span class="n">port</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;port&#39;</span><span class="p">)</span>
</span><span id="line-124">    <span class="n">metadata</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;metadata&#39;</span><span class="p">)</span> <span class="c1"># Optional</span>
</span><span id="line-125">
</span><span id="line-126">    <span class="k">if</span> <span class="ow">not</span> <span class="nb">all</span><span class="p">([</span><span class="n">node_id</span><span class="p">,</span> <span class="n">host</span><span class="p">,</span> <span class="n">port</span><span class="p">]):</span> <span class="c1"># Port can be 0, but typically not for services.</span>
</span><span id="line-127">        <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="s2">&quot;&#39;node_id&#39;, &#39;host&#39;, and &#39;port&#39; are required fields.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">400</span><span class="p">)</span>
</span><span id="line-128">    
</span><span id="line-129">    <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">port</span><span class="p">,</span> <span class="nb">int</span><span class="p">):</span>
</span><span id="line-130">        <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="s2">&quot;&#39;port&#39; must be an integer.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">400</span><span class="p">)</span>
</span><span id="line-131">
</span><span id="line-132">    <span class="k">with</span> <span class="n">NODE_LOCK</span><span class="p">:</span>
</span><span id="line-133">        <span class="n">nodes</span><span class="p">[</span><span class="n">node_id</span><span class="p">]</span> <span class="o">=</span> <span class="p">{</span>
</span><span id="line-134">            <span class="s2">&quot;node_id&quot;</span><span class="p">:</span> <span class="n">node_id</span><span class="p">,</span>
</span><span id="line-135">            <span class="s2">&quot;host&quot;</span><span class="p">:</span> <span class="n">host</span><span class="p">,</span>
</span><span id="line-136">            <span class="s2">&quot;port&quot;</span><span class="p">:</span> <span class="n">port</span><span class="p">,</span>
</span><span id="line-137">            <span class="s2">&quot;metadata&quot;</span><span class="p">:</span> <span class="n">metadata</span> <span class="ow">or</span> <span class="p">{},</span> <span class="c1"># Ensure metadata is a dict</span>
</span><span id="line-138">            <span class="s2">&quot;expires_at&quot;</span><span class="p">:</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span> <span class="o">+</span> <span class="n">LEASE_DURATION</span>
</span><span id="line-139">        <span class="p">}</span>
</span><span id="line-140">    <span class="c1"># print(f&quot;Node registered/updated: {node_id}, Expires at: {nodes[node_id][&#39;expires_at&#39;]}&quot;) # Debug</span>
</span><span id="line-141">    <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">success</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="sa">f</span><span class="s2">&quot;Node &#39;</span><span class="si">{</span><span class="n">node_id</span><span class="si">}</span><span class="s2">&#39; registered successfully.&quot;</span><span class="p">)</span></div>

</span><span id="line-142">
</span><span id="line-143">
<div class="viewcode-block" id="deregister_node_route">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.deregister_node_route">[docs]</a>
</span><span id="line-144"><span class="nd">@isek_center_blueprint</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">&#39;/deregister&#39;</span><span class="p">,</span> <span class="n">methods</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;POST&#39;</span><span class="p">])</span>
</span><span id="line-145"><span class="k">def</span><span class="w"> </span><span class="nf">deregister_node_route</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="n">FlaskResponse</span><span class="p">:</span>
</span><span id="line-146"><span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-147"><span class="sd">    Deregisters a node from the service.</span>
</span><span id="line-148">
</span><span id="line-149"><span class="sd">    Expects a JSON payload with `node_id`.</span>
</span><span id="line-150">
</span><span id="line-151"><span class="sd">    **Request JSON Body:**</span>
</span><span id="line-152"><span class="sd">    </span>
</span><span id="line-153"><span class="sd">    .. code-block:: json</span>
</span><span id="line-154">
</span><span id="line-155"><span class="sd">        {</span>
</span><span id="line-156"><span class="sd">            &quot;node_id&quot;: &quot;unique_node_identifier&quot;</span>
</span><span id="line-157"><span class="sd">        }</span>
</span><span id="line-158">
</span><span id="line-159"><span class="sd">    **Responses:**</span>
</span><span id="line-160"><span class="sd">    </span>
</span><span id="line-161"><span class="sd">    - **200 OK:** Node deregistered successfully.</span>
</span><span id="line-162"><span class="sd">    - **400 Bad Request:** Missing or invalid `node_id`.</span>
</span><span id="line-163"><span class="sd">    - **404 Not Found:** If `node_id` does not exist (alternative to 400 for invalid).</span>
</span><span id="line-164">
</span><span id="line-165"><span class="sd">    :return: A Flask JSON response.</span>
</span><span id="line-166"><span class="sd">    :rtype: FlaskResponse</span>
</span><span id="line-167"><span class="sd">    &quot;&quot;&quot;</span>
</span><span id="line-168">    <span class="n">data</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">json</span>
</span><span id="line-169">    <span class="k">if</span> <span class="ow">not</span> <span class="n">data</span><span class="p">:</span>
</span><span id="line-170">        <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="s2">&quot;Request body must be JSON.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">400</span><span class="p">)</span>
</span><span id="line-171">
</span><span id="line-172">    <span class="n">node_id</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;node_id&#39;</span><span class="p">)</span>
</span><span id="line-173">
</span><span id="line-174">    <span class="k">if</span> <span class="ow">not</span> <span class="n">node_id</span><span class="p">:</span>
</span><span id="line-175">        <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="s2">&quot;&#39;node_id&#39; is required.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">400</span><span class="p">)</span>
</span><span id="line-176">
</span><span id="line-177">    <span class="k">with</span> <span class="n">NODE_LOCK</span><span class="p">:</span>
</span><span id="line-178">        <span class="k">if</span> <span class="n">node_id</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">nodes</span><span class="p">:</span>
</span><span id="line-179">            <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="sa">f</span><span class="s2">&quot;Node &#39;</span><span class="si">{</span><span class="n">node_id</span><span class="si">}</span><span class="s2">&#39; not found for deregistration.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">404</span><span class="p">)</span>
</span><span id="line-180">        <span class="n">removed_node</span> <span class="o">=</span> <span class="n">nodes</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">node_id</span><span class="p">)</span>
</span><span id="line-181">    <span class="c1"># print(f&quot;Node deregistered: {node_id}, Details: {removed_node}&quot;) # Debug</span>
</span><span id="line-182">    <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">success</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="sa">f</span><span class="s2">&quot;Node &#39;</span><span class="si">{</span><span class="n">node_id</span><span class="si">}</span><span class="s2">&#39; deregistered successfully.&quot;</span><span class="p">)</span></div>

</span><span id="line-183">
</span><span id="line-184">
<div class="viewcode-block" id="get_available_nodes_route">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.get_available_nodes_route">[docs]</a>
</span><span id="line-185"><span class="nd">@isek_center_blueprint</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">&#39;/available_nodes&#39;</span><span class="p">,</span> <span class="n">methods</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;GET&#39;</span><span class="p">])</span>
</span><span id="line-186"><span class="k">def</span><span class="w"> </span><span class="nf">get_available_nodes_route</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="n">FlaskResponse</span><span class="p">:</span>
</span><span id="line-187"><span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-188"><span class="sd">    Retrieves a list of all currently active (non-expired) registered nodes.</span>
</span><span id="line-189">
</span><span id="line-190"><span class="sd">    **Responses:**</span>
</span><span id="line-191"><span class="sd">    </span>
</span><span id="line-192"><span class="sd">    - **200 OK:** Returns a list of available nodes.</span>
</span><span id="line-193"><span class="sd">      The response data will be structured as follows:</span>
</span><span id="line-194"><span class="sd">      </span>
</span><span id="line-195"><span class="sd">      .. code-block:: json</span>
</span><span id="line-196"><span class="sd">      </span>
</span><span id="line-197"><span class="sd">          {</span>
</span><span id="line-198"><span class="sd">              &quot;available_nodes&quot;: {</span>
</span><span id="line-199"><span class="sd">                  &quot;node_id_1&quot;: {</span>
</span><span id="line-200"><span class="sd">                      &quot;node_id&quot;: &quot;node_id_1&quot;,</span>
</span><span id="line-201"><span class="sd">                      &quot;host&quot;: &quot;host1.example.com&quot;,</span>
</span><span id="line-202"><span class="sd">                      &quot;port&quot;: 8080,</span>
</span><span id="line-203"><span class="sd">                      &quot;metadata&quot;: {&quot;key1&quot;: &quot;value1&quot;},</span>
</span><span id="line-204"><span class="sd">                      &quot;expires_at&quot;: 1678886400.0</span>
</span><span id="line-205"><span class="sd">                  },</span>
</span><span id="line-206"><span class="sd">                  &quot;node_id_2&quot;: {</span>
</span><span id="line-207"><span class="sd">                      &quot;node_id&quot;: &quot;node_id_2&quot;,</span>
</span><span id="line-208"><span class="sd">                      &quot;host&quot;: &quot;host2.example.com&quot;,</span>
</span><span id="line-209"><span class="sd">                      &quot;port&quot;: 8081,</span>
</span><span id="line-210"><span class="sd">                      &quot;metadata&quot;: {},</span>
</span><span id="line-211"><span class="sd">                      &quot;expires_at&quot;: 1678886500.0</span>
</span><span id="line-212"><span class="sd">                  }</span>
</span><span id="line-213"><span class="sd">              }</span>
</span><span id="line-214"><span class="sd">          }</span>
</span><span id="line-215">
</span><span id="line-216"><span class="sd">    :return: A Flask JSON response containing the available nodes.</span>
</span><span id="line-217"><span class="sd">    :rtype: FlaskResponse</span>
</span><span id="line-218"><span class="sd">    &quot;&quot;&quot;</span>
</span><span id="line-219">    <span class="n">current_time</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
</span><span id="line-220">    <span class="k">with</span> <span class="n">NODE_LOCK</span><span class="p">:</span>
</span><span id="line-221">        <span class="c1"># Create a copy to iterate over, in case cleanup_expired_nodes runs concurrently</span>
</span><span id="line-222">        <span class="c1"># (though cleanup also uses the lock, this is safer for reads if not).</span>
</span><span id="line-223">        <span class="c1"># More importantly, this filters based on expiration.</span>
</span><span id="line-224">        <span class="n">active_nodes</span> <span class="o">=</span> <span class="p">{</span>
</span><span id="line-225">            <span class="n">k</span><span class="p">:</span> <span class="n">v</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">nodes</span><span class="o">.</span><span class="n">items</span><span class="p">()</span> <span class="k">if</span> <span class="n">v</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;expires_at&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="o">&gt;</span> <span class="n">current_time</span>
</span><span id="line-226">        <span class="p">}</span>
</span><span id="line-227">    
</span><span id="line-228">    <span class="n">response_payload</span> <span class="o">=</span> <span class="p">{</span><span class="s2">&quot;available_nodes&quot;</span><span class="p">:</span> <span class="n">active_nodes</span><span class="p">}</span>
</span><span id="line-229">    <span class="c1"># print(f&quot;Returning {len(active_nodes)} available nodes.&quot;) # Debug</span>
</span><span id="line-230">    <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">success</span><span class="p">(</span><span class="n">data</span><span class="o">=</span><span class="n">response_payload</span><span class="p">)</span></div>

</span><span id="line-231">
</span><span id="line-232">
<div class="viewcode-block" id="renew_lease_route">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.renew_lease_route">[docs]</a>
</span><span id="line-233"><span class="nd">@isek_center_blueprint</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">&#39;/renew&#39;</span><span class="p">,</span> <span class="n">methods</span><span class="o">=</span><span class="p">[</span><span class="s1">&#39;POST&#39;</span><span class="p">])</span>
</span><span id="line-234"><span class="k">def</span><span class="w"> </span><span class="nf">renew_lease_route</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="n">FlaskResponse</span><span class="p">:</span>
</span><span id="line-235"><span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-236"><span class="sd">    Renews the lease for an existing registered node.</span>
</span><span id="line-237">
</span><span id="line-238"><span class="sd">    Expects a JSON payload with `node_id`. Updates the node&#39;s `expires_at` timestamp.</span>
</span><span id="line-239">
</span><span id="line-240"><span class="sd">    **Request JSON Body:**</span>
</span><span id="line-241"><span class="sd">    </span>
</span><span id="line-242"><span class="sd">    .. code-block:: json</span>
</span><span id="line-243">
</span><span id="line-244"><span class="sd">        {</span>
</span><span id="line-245"><span class="sd">            &quot;node_id&quot;: &quot;unique_node_identifier&quot;</span>
</span><span id="line-246"><span class="sd">        }</span>
</span><span id="line-247">
</span><span id="line-248"><span class="sd">    **Responses:**</span>
</span><span id="line-249"><span class="sd">    </span>
</span><span id="line-250"><span class="sd">    - **200 OK:** Lease renewed successfully.</span>
</span><span id="line-251"><span class="sd">    - **400 Bad Request:** Missing or invalid `node_id`.</span>
</span><span id="line-252"><span class="sd">    - **404 Not Found:** If `node_id` does not exist.</span>
</span><span id="line-253">
</span><span id="line-254"><span class="sd">    :return: A Flask JSON response.</span>
</span><span id="line-255"><span class="sd">    :rtype: FlaskResponse</span>
</span><span id="line-256"><span class="sd">    &quot;&quot;&quot;</span>
</span><span id="line-257">    <span class="n">data</span> <span class="o">=</span> <span class="n">request</span><span class="o">.</span><span class="n">json</span>
</span><span id="line-258">    <span class="k">if</span> <span class="ow">not</span> <span class="n">data</span><span class="p">:</span>
</span><span id="line-259">        <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="s2">&quot;Request body must be JSON.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">400</span><span class="p">)</span>
</span><span id="line-260">
</span><span id="line-261">    <span class="n">node_id</span> <span class="o">=</span> <span class="n">data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;node_id&#39;</span><span class="p">)</span>
</span><span id="line-262">
</span><span id="line-263">    <span class="k">if</span> <span class="ow">not</span> <span class="n">node_id</span><span class="p">:</span>
</span><span id="line-264">        <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="s2">&quot;&#39;node_id&#39; is required.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">400</span><span class="p">)</span>
</span><span id="line-265">
</span><span id="line-266">    <span class="k">with</span> <span class="n">NODE_LOCK</span><span class="p">:</span>
</span><span id="line-267">        <span class="k">if</span> <span class="n">node_id</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">nodes</span><span class="p">:</span>
</span><span id="line-268">            <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">fail</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="sa">f</span><span class="s2">&quot;Node &#39;</span><span class="si">{</span><span class="n">node_id</span><span class="si">}</span><span class="s2">&#39; not found for lease renewal.&quot;</span><span class="p">,</span> <span class="n">code</span><span class="o">=</span><span class="mi">404</span><span class="p">)</span>
</span><span id="line-269">        
</span><span id="line-270">        <span class="c1"># Check if it&#39;s already expired before renewing (optional, but good for consistency)</span>
</span><span id="line-271">        <span class="c1"># if nodes[node_id].get(&#39;expires_at&#39;, 0) &lt;= time.time():</span>
</span><span id="line-272">        <span class="c1">#     return CommonResponse.fail(message=f&quot;Node &#39;{node_id}&#39; lease has already expired. Please re-register.&quot;, code=410) # 410 Gone</span>
</span><span id="line-273">
</span><span id="line-274">        <span class="n">nodes</span><span class="p">[</span><span class="n">node_id</span><span class="p">][</span><span class="s1">&#39;expires_at&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span> <span class="o">+</span> <span class="n">LEASE_DURATION</span>
</span><span id="line-275">    <span class="c1"># print(f&quot;Lease renewed for node: {node_id}, New expires_at: {nodes[node_id][&#39;expires_at&#39;]}&quot;) # Debug</span>
</span><span id="line-276">    <span class="k">return</span> <span class="n">CommonResponse</span><span class="o">.</span><span class="n">success</span><span class="p">(</span><span class="n">message</span><span class="o">=</span><span class="sa">f</span><span class="s2">&quot;Lease for node &#39;</span><span class="si">{</span><span class="n">node_id</span><span class="si">}</span><span class="s2">&#39; renewed successfully.&quot;</span><span class="p">)</span></div>

</span><span id="line-277">
</span><span id="line-278"><span class="c1"># --- Background Task for Node Cleanup ---</span>
<div class="viewcode-block" id="cleanup_expired_nodes">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.cleanup_expired_nodes">[docs]</a>
</span><span id="line-279"><span class="k">def</span><span class="w"> </span><span class="nf">cleanup_expired_nodes</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
</span><span id="line-280"><span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-281"><span class="sd">    Periodically removes expired nodes from the `nodes` dictionary.</span>
</span><span id="line-282">
</span><span id="line-283"><span class="sd">    This function runs in a separate daemon thread.</span>
</span><span id="line-284"><span class="sd">    It checks every 5 seconds for nodes whose lease (`expires_at`) has passed.</span>
</span><span id="line-285"><span class="sd">    &quot;&quot;&quot;</span>
</span><span id="line-286">    <span class="c1"># print(&quot;Cleanup thread started.&quot;) # Debug</span>
</span><span id="line-287">    <span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
</span><span id="line-288">        <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span> <span class="c1"># Check interval</span>
</span><span id="line-289">        <span class="n">current_time</span> <span class="o">=</span> <span class="n">time</span><span class="o">.</span><span class="n">time</span><span class="p">()</span>
</span><span id="line-290">        <span class="n">expired_node_ids</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">str</span><span class="p">]</span> <span class="o">=</span> <span class="p">[]</span>
</span><span id="line-291">        
</span><span id="line-292">        <span class="k">with</span> <span class="n">NODE_LOCK</span><span class="p">:</span>
</span><span id="line-293">            <span class="c1"># Identify expired nodes without modifying dict during iteration</span>
</span><span id="line-294">            <span class="k">for</span> <span class="n">node_id</span><span class="p">,</span> <span class="n">node_data</span> <span class="ow">in</span> <span class="n">nodes</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
</span><span id="line-295">                <span class="k">if</span> <span class="n">node_data</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;expires_at&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span> <span class="o">&lt;=</span> <span class="n">current_time</span><span class="p">:</span>
</span><span id="line-296">                    <span class="n">expired_node_ids</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">node_id</span><span class="p">)</span>
</span><span id="line-297">            
</span><span id="line-298">            <span class="c1"># Remove expired nodes</span>
</span><span id="line-299">            <span class="k">for</span> <span class="n">node_id</span> <span class="ow">in</span> <span class="n">expired_node_ids</span><span class="p">:</span>
</span><span id="line-300">                <span class="n">removed_node</span> <span class="o">=</span> <span class="n">nodes</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="n">node_id</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> <span class="c1"># Safely remove</span>
</span><span id="line-301">                <span class="k">if</span> <span class="n">removed_node</span><span class="p">:</span>
</span><span id="line-302">                    <span class="c1"># print(f&quot;Cleanup: Removed expired node &#39;{node_id}&#39;. Expired at: {removed_node.get(&#39;expires_at&#39;)}&quot;) # Debug</span>
</span><span id="line-303">                    <span class="k">pass</span> <span class="c1"># Optionally log to Flask/app logger if configured</span></div>

</span><span id="line-304">
</span><span id="line-305"><span class="c1"># --- Main Application Setup ---</span>
<div class="viewcode-block" id="main">
<a class="viewcode-back" href="../../api/core.html#isek.isek_center.main">[docs]</a>
</span><span id="line-306"><span class="k">def</span><span class="w"> </span><span class="nf">main</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="kc">None</span><span class="p">:</span>
</span><span id="line-307"><span class="w">    </span><span class="sd">&quot;&quot;&quot;</span>
</span><span id="line-308"><span class="sd">    Sets up and runs the Flask application for the Isek Center.</span>
</span><span id="line-309">
</span><span id="line-310"><span class="sd">    Initializes a background thread for cleaning up expired node registrations</span>
</span><span id="line-311"><span class="sd">    and starts the Flask development server.</span>
</span><span id="line-312"><span class="sd">    &quot;&quot;&quot;</span>
</span><span id="line-313">    <span class="c1"># Start the cleanup thread</span>
</span><span id="line-314">    <span class="n">cleanup_thread</span> <span class="o">=</span> <span class="n">threading</span><span class="o">.</span><span class="n">Thread</span><span class="p">(</span><span class="n">target</span><span class="o">=</span><span class="n">cleanup_expired_nodes</span><span class="p">,</span> <span class="n">daemon</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
</span><span id="line-315">    <span class="n">cleanup_thread</span><span class="o">.</span><span class="n">start</span><span class="p">()</span>
</span><span id="line-316">
</span><span id="line-317">    <span class="c1"># Create and configure the Flask app</span>
</span><span id="line-318">    <span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
</span><span id="line-319">    <span class="n">app</span><span class="o">.</span><span class="n">register_blueprint</span><span class="p">(</span><span class="n">isek_center_blueprint</span><span class="p">)</span>
</span><span id="line-320">
</span><span id="line-321">    <span class="c1"># Optional: Add a root/health check endpoint</span>
</span><span id="line-322">    <span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">&#39;/&#39;</span><span class="p">)</span>
</span><span id="line-323">    <span class="k">def</span><span class="w"> </span><span class="nf">health_check</span><span class="p">()</span> <span class="o">-&gt;</span> <span class="nb">str</span><span class="p">:</span>
</span><span id="line-324"><span class="w">        </span><span class="sd">&quot;&quot;&quot;Basic health check endpoint.&quot;&quot;&quot;</span>
</span><span id="line-325">        <span class="k">return</span> <span class="s2">&quot;Isek Center is running!&quot;</span>
</span><span id="line-326">
</span><span id="line-327">    <span class="c1"># Run the Flask app</span>
</span><span id="line-328">    <span class="c1"># For production, use a proper WSGI server like Gunicorn or uWSGI</span>
</span><span id="line-329">    <span class="c1"># print(&quot;Starting Isek Center Flask application on http://0.0.0.0:8088&quot;) # Debug</span>
</span><span id="line-330">    <span class="n">app</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">host</span><span class="o">=</span><span class="s1">&#39;0.0.0.0&#39;</span><span class="p">,</span> <span class="n">port</span><span class="o">=</span><span class="mi">8088</span><span class="p">,</span> <span class="n">debug</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span> <span class="c1"># debug=False for production-like behavior</span></div>

</span><span id="line-331">
</span><span id="line-332"><span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">&#39;__main__&#39;</span><span class="p">:</span>
</span><span id="line-333">    <span class="n">main</span><span class="p">()</span>
</span></code></pre></div>
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